Is there a limit on how many times you can do the peerless boss quests? Like once a day? Or do you need to finish all the peerless before you can get the others again?

Coz last night I watched my bf and his friends do dreadhorn. When they finished they tried to get the quest again, but they all got the message that they're too busy doing something else...something like that. Same when they did the others, and tried to do it again.

I had similiar when I tried to do the Thuramagist's quest from Heartwood.. Said I was too busy with other things... hello?? I'm coming to you cause I got nothing to do, ya ninny! LOL

let me ask you would tamers fighting the dreadhorn be good?
thinking of doing that as a guild hunt tonight

You don't have to do the quest again to gain access to the dungeon and fight the peerless.
I think you can only do them once. I know that Aernya's quest to get entrance into Bedlam can only be done once. But beyond that you always have access to the dungeon and the peerless.